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In Caernarfon, the road leads towards the east to cross Afon Seiont near Pont-rug, then turns towards the south-east, past the shore of Llyn Padarn and Llyn Peris and through Llanberis Pass, with the cliffs of Glyder Fawr on the left and Crib Goch on the right, and arrives at Pen-y-pass, the most popular place to climb Snowdon.
Towns and villages on the A4086
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